Thor, or should that be Zeus?

[Chaz]

Ah, braking resistors. Even on my 4KW spindle, I keep getting issues where when I stop the spindle, my VFD goes into overvolt trip. Pain in the ass. Anyone have a view on what size resistor I need for the Hyanyang VFD for this spindle?

Thanks

[Clive S]

Ah, braking resistors. Even on my 4KW spindle, I keep getting issues where when I stop the spindle, my VFD goes into overvolt trip. Pain in the ass. Anyone have a view on what size resistor I need for the Hyanyang VFD for this spindle?

Thanks

Is there not some setting in the vfd to ramp the speed down say over about 4 secs

[Chaz]

Is there not some setting in the vfd to ramp the speed down say over about 4 secs

Ive tried that. All settings, unless I put it on something like a 40 seconds rampdown, it trips.

[m_c]

Download a manual for a decent brand of VFD, which actually lists braking resistor sizes, and see what they recommend for a similar sized VFD/Motor combination.

[Chaz]

Download a manual for a decent brand of VFD, which actually lists braking resistor sizes, and see what they recommend for a similar sized VFD/Motor combination.

Thanks, will try that.

[Chaz]

Some research done. Seems the Chinese VFDs dont come with the internal circuitry to use a braking resistor. Will need to clarify that first.

From what I can tell, values are between 30 - 70 Ohm and around 300W.

[Zeeflyboy]

totally not jealous....

Serious machine you have there Chaz. You must be chuffed!

[battwell]

Nice machine
I have hsd 919 on my machine. I run from single phase using a dual stage vfd. 220 in 380 out.
Stops in3 second no problem

[Chaz]

Nice machine
I have hsd 919 on my machine. I run from single phase using a dual stage vfd. 220 in 380 out.
Stops in3 second no problem

Thanks

Please tell me more about this VFD? Make and model please. Does it output 380v?

[battwell]

My machine has been running about 2 years using huanyang gt series. Il have to find exact model number. The only downside- no braking resistor relay as standard- its special order- but only £5. Also must be modified to run modbus ( I've done this)

I have what seems to be better made "copy" of the same unit here on test too. Has braking interface and is modbus compatible from the factory- even though they don't supply modbus instructions- took me a week to work out how to talk to it. ( I can share the info)
220 single in 380 out.
On my machine running had 919 spindle I rarely see more than 5 amp current draw from the main supply.,
Ecogoo 9100-00750-G-B
While they have a max current draw of 34 amp mine is still working as I originally wired it for test from a 13a plug.

Ecogoo can be found on aliexpress. Delivery was free and only took a few days to arrive. Just checked price at ££251 today
That's the one I'd recommend